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[kern] Make decompiling another 2x faster

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By using font.getGlyphOrder()!
This commit is contained in:
Behdad Esfahbod 2015-05-27 16:51:32 -07:00
parent 4860a88243
commit 1d93f9099d
1 changed files with 11 additions and 3 deletions
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14
Lib/fontTools/ttLib/tables/_k_e_r_n.py
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@ -5,6 +5,7 @@ from fontTools.misc.textTools import safeEval, readHex
from fontTools.misc.fixedTools import fixedToFloat as fi2fl, floatToFixed as fl2fi
from . import DefaultTable
import struct
import array
import warnings
@ -102,9 +103,16 @@ class KernTable_format_0(object):
nPairs, searchRange, entrySelector, rangeShift = struct.unpack(">HHHH", data[:8])
data = data[8:]
for k in range(min(nPairs, len(data) // 6)):
left, right, value = struct.unpack(">HHh", data[6*k:6*k+6])
kernTable[(ttFont.getGlyphName(left), ttFont.getGlyphName(right))] = value
nPairs = min(nPairs, len(data) // 6)
datas = array.array("H", data[:6 * nPairs])
if sys.byteorder != "big":
datas.byteswap()
it = iter(datas)
glyphOrder = ttFont.getGlyphOrder()
for k in range(nPairs):
left, right, value = next(it), next(it), next(it)
if value >= 32768: value -= 65536
kernTable[(glyphOrder[left], glyphOrder[right])] = value
if len(data) > 6 * nPairs:
warnings.warn("excess data in 'kern' subtable: %d bytes" % len(data))